{"cve":"CVE-2026-88007","nvd":{"published":"2026-09-10T15:17:56.183","modified":"2026-09-14T19:58:52.257","status":"Analyzed","description":"Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3 enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":9.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-287","CWE-863"],"references":["https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c","https://github.com/traefik/traefik/pull/13812","https://github.com/traefik/traefik/releases/tag/v2.11.57","https://github.com/traefik/traefik/releases/tag/v3.7.13","https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-88007","score":0.006,"percentile":0.4872,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qqjf-53cj-pwvv","url":"https://osv.dev/vulnerability/GHSA-qqjf-53cj-pwvv","summary":"Traefik HTTP/3 Backend NTLM Connection Reuse","modified":"2026-09-17T17:40:39.744145519Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.0.0 <3.7.13"],"fixed":["3.7.13"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":[">=2.11.0 <2.11.57"],"fixed":["2.11.57"]}]},{"id":"GO-2026-6466","url":"https://osv.dev/vulnerability/GO-2026-6466","summary":"Traefik HTTP/3 Backend NTLM Connection Reuse in github.com/traefik/traefik","modified":"2026-09-17T17:30:12.889986387Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":[">=2.11.0 <2.11.57"],"fixed":["2.11.57"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.0.0 <3.7.13"],"fixed":["3.7.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}